*Excludes Observations that spanned multiple years

Pre 1970156
197018
197122
197228
197369
197448
197543
197628
197717
19787
197941
198079
198141
198269
198373
1984111
1985138
198678
198782
198845
1989151
1990134
1991124
1992178
1993371
1994415
1995342
1996223
1997211
1998339
1999390
2000335
20011005
2002752
2003488
2004625
2005395
2006603
2007563
2008653
2009784
2010575
2011389
2012405
2013318
2014289
2015375
201661
20170
20187
201918
202016
202113
20220
Total12740